<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 400px;
            height: 400px;
            border: 1px solid #000;
            /* position: relative; */
            display:table-cell;
            vertical-align: middle;
            text-align:center;

        }
        .wrap{
            display: inline-block;
            width: 100px;
            height: 100px;
            background-color: red;
           

            }
    </style>
</head>
<body>
    <div class="box">
        <div class="wrap">

        </div>
    </div>
</body>
</html>